Map Service occasionally does not draw in ArcMap

[ModyBuchbinder]

Hello

We have a map service with some layers that is used by many
users.

Once in a while when the user pan/zoom in ArcMap the service
is not drown and the screen is blank.

Hitting the refresh solve the problem but it is still annoying.

It does not happened with web clients looking on the same
service.

We could not find any error messages anywhere (server logs,
event viewer etc.)

Any ideas?

Thanks

[PaulDavidson1]

I would check the server.

Use task manager to see how much % ram is consumed, how many processes are running, etc....

We found a server that had some 200+ pkill processes in hidden cmd processes just hanging around and the 26GB of ram was at 87%.  They say if you get over 85% things will get slow.

We rebooted and things were much cleaner and faster after that.